Here's one of my favorite rook endgames, by Capablanca. It made a deep impression on me when I was learning how to play the endgame. And yes, it's listed in the thread that Shirazi mentioned. Several of my favorite games are included in that list.

One of the reasons that I am a fan of Smyslov's chess is that he was a truly universal player. His endgame technique was the standard for about 20 years, but he also knew how to attack with the best of them, and play subtle positional ideas that confounded even the likes of Petrosian.

Here's one game, played almost two decades after he competed for the world title. It was against one of the best positional players of all time, and yet Smyslov made it look easy.

I particularly like this game because it's an extreme example of the power of the Isolated Queen Pawn. It actually promotes on d8 in the middle game and is immediately decisive!